Advanced Materials Research Vols. 347-353

Abstract: Optical efficiency analysis of conical cavity receiver is introduced in this receiver. Monte-Carlo ray tracing codes was developed to analyze the optical efficiency and heat flux distribution of conical cavity receiver with aperture radius variation. Besides, the impact of slope error variation on the optical efficiency and heat flux distribution are also investigated. The numerical results show that inverted conical cavity receiver with optimized aperture radius has the highest optical efficiency.

Abstract: A novel immunoassay has been developed for the quantitative determination of polybrominated biphenyls (PBBs) using indirect competitive format. A new method was developed to synthesize PBBs congener (PCB15) hapten and its artificial immunogen, then the polyclonal antibodies. The assay was optimized concerning the coating conjugate and antibody concentration, incubation time and temperature, the tolerance to organic solvents and so on. Under optimized conditions, PBB15 can be determined in the concentration range of 0.01-100 μg L-1 with a detection limit of 0.02 μg L-1. The cross-reactivities of the assays were below 8%. While water samples could be analyzed directly.

Abstract: Abstract: Based on the analysis of heat and mass transfer and an empirical correlation, a new desalination unit which utilizes solar or waste energy has been developed and tested. In this desalination, a considerable fraction of the latent and sensible heat was successfully recycled and utilized for enhancing falling evaporation-condensation and preheating seawater via remaining heat. The performance of the unit was tested through experiments using an electric heater as heat source. The results indicate that the unit has excellent transient-state performance for effective heat and mass transfer. As a result of the unit operating with a solar system under practical weather conditions, the yield was about five times greater than that of a conventional single solar basin still with the same thermal energy input. The main factors which influence the freshwater yield were researched and analyzed. The reasonable ranges of some parameters were presented.

Abstract: Coal plays an important role in economical development and social progress, how to use it efficiently and how to set up circular economy system and evaluate its efficiency is a topic of most concern.Material flow analysis is provided as a useful to in the field of circular economy in coal mining area. In this paper, circular economy development model in coal mining area is analyzed, based on this, the framework about coal flow in circular process of coal production and usage is put forward. The method of the evaluation about the circular economy in coal mining area is also given out.

Abstract: Nuclear power station has high safety requirements, and the safety systems related to the nuclear island must be checked by hydraulic calculation. In the conventional island, the safe shutdown of the nuclear island most closely relates to the feedwater system, which determines the quantity and quality of the feedwater supply to the steam generator. In this paper, feedwater evolution in case of steamline break will be presented by using Flowmaster hydraulic software, and the results was used as the input for the analysis of security assessment in the nuclear island.

Abstract: In this paper, according to research difficulties of rebuilding underground natural gas storages from carbonate buried hill gas reservoirs, we select a variety of relevant technologies and methods to study. Considering the reservoir geologic features geology, the impact of water intrusion, the difference of reserve calculations and many other factors, we carry out the research and determine the key parameters of rebuilding underground natural gas storages, and finally get a reasonable understanding of the study. Upon completion of large-scale gas storage for research results, further to form the distinctive key technologies of rebuilding underground natural gas storages from carbonate buried hill gas reservoirs. The research results will provide the appropriate technical reference for similar future rebuilding underground gas storages and also provide the technical assurance for a safe and stable gas supply to Beijing, Tianjin and Hebei region.

Abstract: The goal of shantytowns redevelopment is to improve urban appearances and inhabitant's environments and enhance urban images and inhabitant's qualities of life. So far, numerous cities in China set about to reconstructing the project of shantytowns. However, the majority of shantytowns redevelopments have focused on dismantling houses rather than systematically rebuilding the shantytowns. Aiming at this issue, we explored the relations of shantytowns redevelopment and urban regeneration and drew on quite a lot of domestic and foreign experiences and lessons of slum redevelopment, which suggested that shantytowns redevelopment is involved in not only the pure physical regeneration, but also social regeneration, associated with economic recovery, community rebuilding and cultural reconstructions. By analyzing the case of shantytowns redevelopment of Fuxin city in Liaoning Province, we found a large quantity of questions exhibited by the current shantytowns redevelopment.

Abstract: This study discussed what rotary ultrasonic machining (RUM) and tool geometry parameters combination can obtain bigger material removal rate (MRR) in drilling. The experimental configuration of this study was planned using Taguchi orthogonal array, where the drill diameter, rotation speed, power and feed rate were taken as the experimental factors. A relation model among the MRR and standard deviation of the holes walls and processing parameters and tool geometry was established, so as to achieve maximum MRR of the overall deep holes walls. The experimental results proved that application of the optimized parameters combination in rotary ultrasonic machining of holes processing can obtain bigger and better removal rate of holes walls. The effect of control factors on the holes quality was discussed from the straightness deviation and maximum material removal rate of related factors on the holes when the Taguchi method was used in rotary ultrasonic machining of holes drilling. The results showed that rotation speed, power, and feed rate under bigger level have a larger MRR than that of other level in a fixed drill diameter.

Abstract: The formation and evolution of paleostructures have an important impact on the migration, accumulation and distribution of ancient and present petroleum. This paper makes a particularly description of several common paleostructural restoration methods, including thickness method, tectonic reconstruction method, backstripping analysis method, paleo-horizon restoration method, balanced geological cross-section method and line-drawing method. Among them, line-drawing method is a new way to do research in paleostructures using seismic sections. Besides, this paper also concludes the factors which affect restoration of paleostructures.

Abstract: The paper describes the three-tier stereo comprehensive management gas model for the mining height and extended mining face in the high gas mine. The model consists of gas drainage with surface drilling, progressive and shielding gas drainage with 1000m drilling machine from underground and so on. The measures make it easy to realize the combination of surface fracturing and gas extraction, establish the model of cooperation methane drainage from the surface and underground. Meanwhile, the ventilation type, three incoming-air gateways and two returning-air gateways, is used in the mining face. It can effectively avoid exceeding gas in the upper corner of mining face. It can guarantee safe and high-efficient mining. The green mining technology for coal and gas for simultaneous extraction is easily realized. It has important guiding value for mine gas management at similar conditions.